Fls 1-2 per stem, 65 mm wide, opening yellow; perianth segments broadly ovate, prominently mucronate, becoming ivory white, spreading or a little inflexed, with margins incurling, overlapping half; inner segments more nearly roundish, less noticeably mucronate, with margins deeply incurved; cup is bowl-shaped, broadly ribbed, becoming between brilliant yellow and light greenish yellow, with creamy white at rim, mouth very shallowly lobed, wavy, with rim minutely notched.